With the cloud model technique, which represents a formal solution of the transfer equation under some assumptions, two plasma clouds, one with high speeds (blueshifts of 290 km s\(^{-1}\) ) and one with medium speed (blueshifts of 36 km s\(^{-1}\) ) were detected. The identification of “explosive” i.e. 290 km s\(^{-1}\)  flow is unique in such circumstance of reconnection. We conjecture that cool plasma was trapped between the two EMFs which could correspond to arch filament plasma and was expelled during the reconnection. The second cloud with lower velocity is certainly due to the surge plasma accompanying the jet. Such models are used to derive true velocities which usually differ from
those obtained from Doppler shifts (this is the basic idea behind the cloud
model). Then the question is what is the nature of the obtained velocities,
expelled plasma blobs like in surges [1]}, [2]} as we suggested, upflows (evaporation), downflows (chromospheric condensations) as it is proposed for flares [3]}, [4]}. However using the cloud-model technique cannot help us for the proper understanding of the nature of detected flows, it is just a diagnostics method. Numerical simulations using RADYN and RH [5]} or Flarix RHD codes [6]} would certainly give more insights on the physical process involved. We found similarities between such simulation models and our observations like the high variability of the Si IV lines depending strongly on opacity effects. These observations could be the boundary conditions of future simulations.
